William lockhart morton



(No Model.)

W. L. MORTON.

KNOB ATTACHMENT.

No. 451,503. Patented May 5, 1891.

JQura 5.

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UNITED STATES PATENT OEEIcE.

WILLIAM LOCKHART MORTON, OF SOUTH YARRA, NEAR MELBOURNE,

VICTORIA.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 451,503, dated May 5,1891.

Application filed September 10,1890. Serial No. 364,585. (No model.)

To It whom it may concern.-

Be it known that- I, WILLIAM LOOKII RT MORTON, of South Yarra, near thecity of Melbourne, in the county of Bourke and Colony of Victoria, haveinvented certain new and useful Improvements in Door-Knob Attachments;and I do hereby declare that the following is a full, clear, and exactdescription of the-invention, that will enable others skilledin the artto which it appertains to make and use the same.

The object of my invention is to provide a simple and permanentlyeffective door-knob attachment by means of certain new and usefulimprovements in the construction of the knob and spindle. In some otherinventions washers are required, in order that the knob may be readilyadjustable to suit doors of different thickness; but in this inventionthis Object is effected without washers.

My invention, to these ends, consistsin the combination of partshereinafter set forth and claimed.

Referring to the accompanying drawings, which illustrate my inventionand form a part of this specification, Figure 1 shows a' View, partly inlongitudinal central section, ofa door knob and spindle securedtogether. Fig. 2 shows an elevation of the outer face or head of theknob. Figs. 3 and a show sectional views of alternative forms of flangednuts as secured to the spindle.

Referring to Fig. 1, a shows the knob; b, the spindle; c, a socket-nut;g, the door; f, the rose.

In this invention I provide a square spindle having at its end acylindrical portion of reduced diameter. The cylindrical portion ofreduced diameter is threaded with a lefthand male screw-thread, (shownby e in drawings,) and the adjoining square portion of the spindle offull diameter is threaded at its corners with a right-hand malescrew-thread. (Shown by d in drawings.) Then the spindle has been passedthrough the door, both the threaded parts are projecting more or less,according to the thickness of the door, the case shown in Fig. 1 beingthat of a thin door. The knob-shank is internally threaded with aright-hand thread (shown by a in Fig. 1) to screw onto the the thread clof the spindle until the knob meets the rose. The object of reducing thediameter of the spindle at e is to enable it to pass through theknob-shank. The head of the knob has an aperture with countersunk orbeveled edges, and through this aperture I pass a socket-nut c, with ascrew-driver head having a left-handed female thread 0 on drawings,which I screw onto the end of the spindle until the head of thesocket-nut is screwed tight home to the knob, thus closing the aperturetherein. It is now impossible for the knob to work itself loose orbecome shaky on the spindle by the wear and tear of constant use. It isnot necessary to make the male thread at (Z righthanded and that at eleft-handed with corresponding female threads on the knob-shank andsocket-nut, respectively, as the thread at (1 may be left-handed andthat at 3 righthanded, so long as one is the reverse of the other, toinsure that any tendency of the knob to screw off will be checked by therefusal of the socket-nut to screw in the same direction, so that thehead of the socket-nut always holds the knob securely.

Instead of having a screw-driver head, the head of the socket-nut may besquare or polygon a1 and be turned by a spanner, and may project fromthe knob-face, instead of having its edges flush with it, these formsbeing severally indicated in the drawings.

' That I claim is- The combination, with a knob having aninternally-threaded shank and an aperture in the exterior face, of asquare spindle screwthreaded to receive the shank of the knob andhavingits extremity of reduced diameter, with a screw-thread thereon cutin the reverse direction to the thread which receives the knob-shank,and a socket nut internally threaded to screw onto the extremity of thespindle and having a flanged head to close and cover the aperture in theknob, substantially as and for the purposes specified.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

\VILLIAM LOCKIIART MORTON.

Witnesses:

G. G. TURRI, A. H. PRICE.

